Adding support for `option` selected state checking.
Adding "isSelected" method to "CoreDriver" to keep BC with drivers, that don't (yet) have implementation for it.
Ability to submit forms.
Merge pull request #375 from aik099/form-submit-feat

Ability to submit forms
Merge pull request #372 from aik099/driver-is-selected-feat

Adding support for `option` selected state checking via new `isSelected` method of a driver